28813530221 has 24 divisors (see below), whose sum is σ = 34108179840. Its totient is φ = 24262832832.

The previous prime is 28813530217. The next prime is 28813530283. The reversal of 28813530221 is 12203531882.

It is not a de Polignac number, because 28813530221 - 2² = 28813530217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813530121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7072241 + ... + 7076313.

It is an arithmetic number, because the mean of its divisors is an integer number (1421174160).

Almost surely, 2^28813530221 is an apocalyptic number.

It is an amenable number.

28813530221 is a deficient number, since it is larger than the sum of its proper divisors (5294649619).

28813530221 is a wasteful number, since it uses less digits than its factorization.

28813530221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593 (or 6586 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 28813530221 in words is "twenty-eight billion, eight hundred thirteen million, five hundred thirty thousand, two hundred twenty-one".